Fix QA warnings caused by implicit declarations, such as

* QA Notice: Package triggers severe warnings which indicate that it
*            may exhibit random runtime failures.
* wnd.c:1081:4: warning: implicit declaration of function ‘add_wch’ [-Wimplicit-function-declaration]

--- mpfc-1.3.8.1/libmpfc/file_http.c
+++ mpfc-1.3.8.1/libmpfc/file_http.c
@@ -35,6 +35,7 @@
 #include "file.h"
 #include "file_http.h"
 #include "mystring.h"
+#include "util.h"
 
 /* Get file data */
 #define FHTTP_GET_DATA(data, file) \
--- mpfc-1.3.8.1/libmpfc/id3.c
+++ mpfc-1.3.8.1/libmpfc/id3.c
@@ -26,6 +26,7 @@
 #include <unicode/ucnv.h>
 #include "types.h"
 #include "myid3.h"
+#include "util.h"
 
 /* Create a new empty tag */
 id3_tag_t *id3_new( void )
--- mpfc-1.3.8.1/libmpfc/logger.c
+++ mpfc-1.3.8.1/libmpfc/logger.c
@@ -28,6 +28,8 @@
 #include "cfg.h"
 #include "logger.h"
 
+int logger_get_level( logger_t *log );
+
 /* Initialize logger */
 logger_t *logger_new( cfg_node_t *cfg_list, char *file_name )
 {
--- mpfc-1.3.8.1/libmpfcwnd/wnd.h
+++ mpfc-1.3.8.1/libmpfcwnd/wnd.h
@@ -23,7 +23,6 @@
 #ifndef __SG_MPFC_WND_H__
 #define __SG_MPFC_WND_H__
 
-#define _XOPEN_SOURCE_EXTENDED
 #include <curses.h>
 #include "types.h"
 #include "cfg.h"
--- mpfc-1.3.8.1/libmpfcwnd/wnd.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd.c
@@ -29,6 +29,8 @@
 #include "logger.h"
 #include "wnd.h"
 #include "wnd_root.h"
+#include "util.h"
+#include <curses.h>
 
 /* Initialize window system and create root window */
 wnd_t *wnd_init( cfg_node_t *cfg_list, logger_t *log )
--- mpfc-1.3.8.1/libmpfcwnd/wnd_combobox.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd_combobox.c
@@ -28,6 +28,8 @@
 #include "wnd_dlgitem.h"
 #include "wnd_editbox.h"
 #include "wnd_hbox.h"
+#include "wnd_label.h"
+#include "util.h"
 
 /* Create a new combo box */
 combo_t *combo_new( wnd_t *parent, char *id, char *text, char letter, 
--- mpfc-1.3.8.1/libmpfcwnd/wnd_filebox.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd_filebox.c
@@ -24,7 +24,6 @@
 #include <fnmatch.h>
 #include <stdio.h>
 #include <stdlib.h>
-#define __USE_GNU
 #include <string.h>
 #include <unistd.h>
 #include "types.h"
@@ -33,6 +32,8 @@
 #include "wnd_editbox.h"
 #include "wnd_filebox.h"
 #include "wnd_hbox.h"
+#include "wnd_label.h"
+#include "util.h"
 
 /* Create a new file box */
 filebox_t *filebox_new( wnd_t *parent, char *id, char *text, char letter,
--- mpfc-1.3.8.1/libmpfcwnd/wnd_mouse.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd_mouse.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "wnd.h"
+#include "util.h"
 
 /* Initialize mouse */
 wnd_mouse_data_t *wnd_mouse_init( wnd_global_data_t *global )
--- mpfc-1.3.8.1/libmpfcwnd/wnd_print.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd_print.c
@@ -32,6 +32,7 @@
 #include "types.h"
 #include "wnd.h"
 #include "wnd_print.h"
+#include "util.h"
 
 /* Move cursor to a specified position */
 void wnd_move( wnd_t *wnd, wnd_move_style_t style, int x, int y )
--- mpfc-1.3.8.1/libmpfcwnd/wnd_repval.c
+++ mpfc-1.3.8.1/libmpfcwnd/wnd_repval.c
@@ -25,6 +25,7 @@
 #include "wnd_dialog.h"
 #include "wnd_editbox.h"
 #include "wnd_repval.h"
+#include "wnd_label.h"
 
 /* Create a repeat value dialog */
 dialog_t *wnd_repval_new( wnd_t *parent, void *on_ok, int dig )
--- mpfc-1.3.8.1/src/browser.c
+++ mpfc-1.3.8.1/src/browser.c
@@ -24,6 +24,7 @@
 #include <glob.h>
 #include <string.h>
 #include <sys/types.h>
+#include <fnmatch.h>
 #include "types.h"
 #include "browser.h"
 #include "help_screen.h"
--- mpfc-1.3.8.1/src/info_rw_thread.c
+++ mpfc-1.3.8.1/src/info_rw_thread.c
@@ -27,6 +27,7 @@
 #include "info_rw_thread.h"
 #include "player.h"
 #include "song.h"
+#include "util.h"
 
 /* Thread queue */
 irw_queue_t *irw_head, *irw_tail;
--- mpfc-1.3.8.1/src/player.c
+++ mpfc-1.3.8.1/src/player.c
@@ -35,6 +35,7 @@
 #include "command.h"
 #include "eqwnd.h"
 #include "file.h"
+#include "genp.h"
 #include "help_screen.h"
 #include "logger.h"
 #include "logger_view.h"
@@ -57,8 +58,13 @@
 #include "wnd_listbox.h"
 #include "wnd_multiview_dialog.h"
 #include "wnd_radio.h"
+#include "wnd_repval.h"
 #include "wnd_root.h"
 #include "xconvert.h"
+#include "info_rw_thread.h"
+
+void pmng_hook( pmng_t *pmng, char *hook );
+void outp_set_mixer_type( out_plugin_t *p, plugin_mixer_type_t type );
 
 /*****
  *
--- mpfc-1.3.8.1/src/plist.c
+++ mpfc-1.3.8.1/src/plist.c
@@ -36,6 +36,7 @@
 #include "util.h"
 #include "undo.h"
 #include "wnd.h"
+#include "info_rw_thread.h"
 
 extern void pmng_hook( pmng_t *pmng, char *hook );
 
--- mpfc-1.3.8.1/src/util.h
+++ mpfc-1.3.8.1/src/util.h
@@ -26,6 +26,8 @@
 #include <stdio.h>
 #include "types.h"
 
+int mbslen( char *str );
+
 /* Write message to log file */
 void util_log( char *format, ... );
 
--- mpfc-1.3.8.1/src/vfs.h
+++ mpfc-1.3.8.1/src/vfs.h
@@ -36,6 +36,7 @@
 } vfs_t;
 
 /* Check that input plugin uses VFS */
+dword inp_get_flags( in_plugin_t *p );
 #define VFS_INP_HAS(inp)	(inp_get_flags(inp) & INP_VFS)
 
 /* Get logger object */